VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512
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Univ Arizona, Dept Astron, Steward ObservIssue Date
2017-08-25Keywords
brown dwarfscircumstellar matter
planets and satellites: formation
protoplanetary disks
stars: individual (2M0444)
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IOP PUBLISHING LTDCitation
VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512 2017, 846 (1):19 The Astrophysical JournalJournal
The Astrophysical JournalRights
© 2017. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We present multi-wavelength radio observations obtained with the VLA of the protoplanetary disk surrounding the young brown dwarf 2MASS J04442713+2512164 (2M0444) in the Taurus star-forming region. 2M0444 is the brightest known brown dwarf disk at millimeter wavelengths, making this an ideal target to probe radio emission from a young brown dwarf. Thermal emission from dust in the disk is detected at 6.8 and 9.1 mm, whereas the 1.36 cm measured flux is dominated by ionized gas emission. We combine these data with previous observations at shorter sub-mm and mm wavelengths to test the predictions of dust evolution models in gas-rich disks after adapting their parameters to the case of 2M0444. These models show that the radial drift mechanism affecting solids in a gaseous environment has to be either completely made inefficient, or significantly slowed down by very strong gas pressure bumps in order to explain the presence of mm/cm-sized grains in the outer regions of the 2M0444 disk. We also discuss the possible mechanisms for the origin of the ionized gas emission detected at 1.36 cm. The inferred radio luminosity for this emission is in line with the relation between radio and bolometric luminosity valid for for more massive and luminous young stellar objects, and extrapolated down to the very low luminosity of the 2M0444 brown dwarf.ISSN
1538-4357Version
Final published versionSponsors
European Research Council (ERC) under the European Union's Horizon research and innovation programme [714769]Additional Links
http://stacks.iop.org/0004-637X/846/i=1/a=19?key=crossref.4276cf8d882c700ef4c062936739350fae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/aa81bf